Introduction: contributions of the cooperative groups.
Perry
Michael C
MC
Ellis Fischel Cancer Center, Columbia, MO, USA.
Comis
Robert L
RL
Schilsky
Richard L
RL
D002986:Clinical Trials as Topic; D003299:Cooperative Behavior; D006801:Humans; D008495:Medical Oncology / Q000458:organization & administration*; D009369:Neoplasms / Q000175:diagnosis / Q000628:therapy*; D012106:Research / Q000458:organization & administration